Then said Eliakim the son of Hilkiah, and Shebna, and Joah, unto Rabshakeh, Speak, I pray thee, to thy servants in the Syrian language; for we understand [it]: and talk not with us in the Jews' language in the ears of the people that [are] on the wall. (18:26)

--Ezra--

And in the days of Artaxerxes wrote Bishlam, Mithredath, Tabeel, and the rest of their companions, unto Artaxerxes king of Persia; and the writing of the letter [was] written in the Syrian tongue, and interpreted in the Syrian tongue. (4:7)

--Daniel--

Then spake the Chaldeans to the king in Syriack, O king, live for ever: tell thy servants the dream, and we will show the interpretation. (2:4)